heat sink

Abstract

Provided is a heat sink that has excellent thermal connectivity to a heat generation body to be cooled, and exhibits a superior heat transfer amount when transferring heat of the heat generation body, even when other components are disposed around the heat generation body.　This heat sink comprises: a container that has a cavity part formed therein and that has a first main surface and a second main surface opposite the first main surface; a working fluid encapsulated in the cavity part; and a vapor flow path which is provided in the cavity part and through which the working fluid in a gas phase flows. The container has a flat surface part and a protruding part that protrudes outward from the flat surface part. An inner space of the protruding part of the container is connected to an inner space of the flat surface part so as to form the cavity part. The protruding part of the container has a heat-receiving section thermally connected to a heat generation body to be cooled. The flat surface part of the container has a middle region linked to the protruding part, and a heat dissipation region which is further away from the protruding part than is the middle region and to which a heat dissipation fin is thermally connected.

Description

[Technical field]

[0001] The present invention relates to a heat sink that has excellent heat transport properties and thereby exhibits excellent cooling properties. [Background technology]

[0002] In recent years, cooling of electronic components such as semiconductor elements mounted in electric and electronic equipment has become more important because the amount of heat generated by electronic components increases with the advancement of their functionality, and electronic components are densely mounted. As a method for cooling heat-generating bodies such as electronic components arranged in a small space, a method is used in which the heat of the electronic components is transported outside the board on which the electronic components are mounted and then dissipated. As a cooling device that transports the heat of electronic components outside the board and then dissipates the heat, a heat sink having a plurality of heat pipes, one end of which is thermally connected to the electronic components, and the other end of which is provided with heat dissipation fins, is sometimes used.

[0003] Specifically, a cooling device has been proposed in which two heat pipes are pulled out from a heat receiving part that is in contact with circuit components on a circuit board, the pulled out ends of the heat dissipation side are thermally connected to different heat dissipation fins, and the heat dissipation fins are cooled by a fan positioned between each of the heat dissipation fins (Patent Document 1).

[0004] However, in the cooling device of Patent Document 1, a heat pipe having a tubular container is used as a heat transport member, and the heat of a heat generating body arranged on a circuit board is transported to outside the circuit board by using the heat transport function of the heat pipe. Since the amount of heat transported when transporting heat to outside the circuit board is largely dependent on the cross-sectional area of ​​the heat transport member in the direction perpendicular to the heat transport direction, Patent Document 1 has a problem that the amount of heat transported when transporting heat to outside the circuit board is insufficient, and the cooling characteristics are insufficient.

[0005] In addition, as the functionality of electric and electronic devices increases, heat generating elements such as electronic components are mounted at high density, and various other components are arranged around the heat generating elements such as electronic components to be cooled. Therefore, when using a heat pipe to transport heat from electronic components to the outside of a board, it is necessary to arrange the heat pipe so as to avoid the other components arranged around the heat generating elements to be cooled. Generally, in a small space, a tubular container is bent in the height direction of the other components to arrange the heat pipe so as to straddle the other components arranged around the heat generating elements to be cooled, thereby avoiding the other components.

[0006] However, when the tubular container is bent in the height direction of the other components, a curved surface is formed at the bent portion of the tubular container, which may cause a gap between the heat pipe and the heating element to be cooled at the bent portion of the tubular container, resulting in a problem that the thermal connectivity between the heating element and the heat pipe may not be sufficient. In order to obtain thermal connectivity between the heating element and the heat pipe, it has been considered to not bend the heat pipe and not provide the heat pipe in the area where the other components are located, but if the heat pipe is not provided in the area where the other components are located, the number of heat pipes installed will be reduced, resulting in a problem that the amount of heat transport cannot be sufficient. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2001-217366 A Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above circumstances, the present invention aims to provide a heat sink that has excellent thermal connectivity with a heat generating body to be cooled, even when other components are placed around the heat generating body, and that has excellent cooling characteristics by demonstrating excellent heat transport capacity when transporting heat from the heat generating body to be cooled. [Means for solving the problem]

[0009] The gist of the configuration of the present invention is as follows. [1] A container having a cavity formed therein and a first main surface and a second main surface opposite to the first main surface, a working fluid sealed in the cavity, and a vapor flow path provided in the cavity through which the working fluid in a gas phase flows; The container has a flat surface and a protrusion protruding outward from the flat surface, The internal space of the protruding portion of the container is in communication with the internal space of the flat portion, thereby forming the hollow portion, the protrusion of the container has a heat receiving portion to which a heat generating element to be cooled is thermally connected, A heat sink, wherein the flat surface of the container has an intermediate region connected to the convex portion, and a heat dissipation region to which a heat dissipation fin is thermally connected, the intermediate region being farther away from the convex portion than the convex portion. [2] The heat sink described in [1], wherein the heat dissipation fins include a first heat dissipation fin thermally connected to the first main surface and a second heat dissipation fin thermally connected to the second main surface. [3] The heat sink according to [1] or [2], wherein the area of ​​the heat dissipation portion of the container is wider than the protrusion. [4] The heat sink described in [3], wherein the container has a portion that becomes wider from the convex portion toward the heat dissipation portion area. [5] The heat sink described in [1] or [2], wherein the container has a shape having a longitudinal direction and a transverse direction when viewed in a plane, the convex portion is provided at one longitudinal end of the container, and the other longitudinal end of the container is the area of ​​the heat dissipation portion. [6] The heat sink described in [1] or [2], wherein the container has a shape having a longitudinal direction and a transverse direction when viewed in a plane, the convex portion is provided in the center of the container in the longitudinal direction, and both ends of the container in the longitudinal direction are areas of the heat dissipation portion. [7] The heat sink according to [1] or [2], wherein the container has the convex portion in the center of the container when viewed in a plan view, and the peripheral portion of the container when viewed in a plan view is the area of ​​the heat dissipation portion. [8] A heat sink as described in [1] or [2], wherein the container has a longitudinal direction and a transverse direction when viewed in a plan view, the longitudinal direction has a curved shape, the convex portion is provided at one end and the other end of the container in the longitudinal direction, and the central portion of the container in the longitudinal direction is the area of ​​the heat dissipation portion. [9] The heat sink described in [1] or [2], wherein the container is formed by one plate-shaped body and another plate-shaped body facing the one plate-shaped body, and the one plate-shaped body has a convex portion protruding outward.

[0010] In the heat sink embodiment of [1] above, the container has a flat portion and a protrusion protruding outward from the flat portion, and the protrusion has a heat receiving portion to which the heat generating element is thermally connected. The flat portion also has a heat dissipation area to which the heat dissipation fin is thermally connected, and an intermediate area connected to the protrusion, which is provided between the protrusion and the heat dissipation area and is not thermally connected to the heat generating element. The intermediate area of ​​the container is an area where heat is not actively received. Therefore, in the heat sink of [1] above, the heat of the heat generating element is transported from the protrusion, which is the heat receiving area, through the intermediate area, which is the flat portion, to the heat dissipation area, which is the area of ​​the flat portion away from the protrusion, and is dissipated to the external environment in the heat dissipation area.

[0011] In the heat sink aspect of [1] above, the container has a first main surface and a second main surface opposite to the first main surface, a cavity is formed therein, and includes a working fluid sealed in the cavity and a vapor flow path provided in the cavity through which the working fluid in gas phase flows. Therefore, in the heat sink aspect of [1] above, the container is flat, and the internal space of the container that exhibits a heat transport function is connected and integrated. Effect of the Invention

[0012] According to an aspect of the heat sink of the present invention, the container has a flat portion and a convex portion protruding outward from the flat portion, and the convex portion has a heat receiving portion that is thermally connected to a heat generating element to be cooled, so that even if other components are arranged around the heat generating element, the container can avoid the other components in the height direction of the other components without bending the container. That is, in an aspect of the heat sink of the present invention, the flat portion has an intermediate region connected to the convex portion, so that even if other components are arranged around the heat generating element, the container can avoid the other components in the height direction of the other components without bending the container. Therefore, the heat sink of the present invention has excellent thermal connectivity between the container and the heat generating element and has excellent cooling characteristics. Also, according to an aspect of the heat sink of the present invention, the internal space of the container is in an integrated form that is connected to each other, and the cross-sectional area of ​​the container in the direction perpendicular to the heat transport direction is increased, so that the heat transport amount is excellent. Therefore, according to an aspect of the heat sink of the present invention, the planar portion of the container has an intermediate region connected to the convex portion, and a heat dissipation region to which the heat dissipation fins are thermally connected that is farther away from the convex portion than the intermediate region, thereby providing excellent heat transport capacity when transporting heat from the heat-generating element to be cooled via the intermediate portion to the heat dissipation portion, thereby providing excellent cooling characteristics.

[0013] According to the heat sink aspect of the present invention, the heat dissipation fin has a first heat dissipation fin thermally connected to the first main surface and a second heat dissipation fin thermally connected to the second main surface, so that the fin area of ​​the heat dissipation fin can be increased, and thus even better cooling characteristics can be exhibited. Also, according to the heat sink aspect of the present invention, the heat dissipation fin is thermally connected to the heat dissipation part of the container in an aspect in which the heat dissipation fin is divided into a first heat dissipation fin and a second heat dissipation fin, so that even if the fin area of ​​the heat dissipation fin is increased, it is possible to prevent the occurrence of an area of ​​the heat dissipation fin that cannot sufficiently contribute to heat dissipation, and improve the heat dissipation efficiency of the heat dissipation fin.

[0014] According to an aspect of the heat sink of the present invention, the area of ​​the heat dissipation portion of the container is wider than the convex portion, so that the number of heat dissipation fins that can be installed can be increased, thereby providing even better cooling characteristics.

[0015] According to an embodiment of the heat sink of the present invention, the positions of the flat and convex parts of the container can be designed according to the space in which the heat sink is installed, the arrangement of the heating element, the amount of heat generated, etc., so that the positions of the heat receiving part, intermediate part, and heat dissipation part can be set, offering excellent design freedom even for heating elements placed in narrow spaces. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a plan view illustrating an overview of a heat sink according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a side view illustrating an overview of a heat sink according to a first embodiment of the present invention. [Diagram 3] FIG. 11 is a plan view illustrating the outline of a heat sink according to a second embodiment of the present invention. [Figure 4] FIG. 11 is a side view illustrating the outline of a heat sink according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a plan view illustrating the outline of a heat sink according to a third embodiment of the present invention. [Figure 6] FIG. 11 is a side view illustrating the outline of a heat sink according to a third embodiment of the present invention. [Figure 7] FIG. 11 is a plan view illustrating the outline of a heat sink according to a fourth embodiment of the present invention. [Figure 8] FIG. 11 is a side view illustrating the outline of a heat sink according to a fourth embodiment of the present invention. [Figure 9] FIG. 13 is a plan view illustrating the outline of a heat sink according to a fifth embodiment of the present invention. [Figure 10] FIG. 13 is a side view illustrating the outline of a heat sink according to a fifth embodiment of the present invention. [Figure 11] FIG. 13 is a plan view illustrating the outline of a heat sink according to a sixth embodiment of the present invention. [Figure 12] FIG. 13 is a side view illustrating the outline of a heat sink according to a sixth embodiment of the present invention. [Figure 13] FIG. 13 is a plan view illustrating the outline of a heat sink according to a seventh embodiment of the present invention. [Figure 14] FIG. 13 is a side view illustrating the outline of a heat sink according to a seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The heat sink according to the first embodiment of the present invention will be described in detail below. Fig. 1 is a plan view illustrating the outline of the heat sink according to the first embodiment of the present invention. Fig. 2 is a side view illustrating the outline of the heat sink according to the first embodiment of the present invention.

[0018] 1 and 2, a heat sink 1 according to a first embodiment of the present invention includes a container 10 having a cavity 13 formed therein by stacking two opposing plate-like bodies, i.e., one plate-like body 11 and the other plate-like body 12 opposing the one plate-like body 11, and a working fluid (not shown) sealed in the cavity 13 and a vapor flow path 15 provided in the cavity 13 through which the gas-phase working fluid flows. The container 10 with the cavity 13 formed therein and the working fluid and vapor flow path 15 form a heat transport part of the heat sink 1.

[0019] The container 10 is a thin, flat container, in which one plate-like body 11 has a first face 21 which is a first main surface, and the other plate-like body 12 has a second face 22 which is a second main surface. Thus, the container 10, in which the cavity 13 is formed, has the first face 21 which is a first main surface, and the second face 22 which is a second main surface opposite the first face 21.

[0020] The first surface 21 has a flat planar portion 32 and a convex portion 31 protruding outward from the planar portion 32. In the heat sink 1, the convex portion 31 is provided on one end of the first surface 21 of the container 10 in the heat transport direction H of the container 10. The side of the convex portion 31 protrudes vertically from the planar portion 32. On the other hand, the second surface 22 does not have a convex portion, and the entire second surface 22 is a flat planar portion. Since the first surface 21 has the planar portion 32 and the convex portion 31 protruding outward from the planar portion 32, the container 10 has a planar portion 17 and a convex portion 16 protruding outward from the planar portion 17. Therefore, one plate-like body 11 has a convex portion 16 protruding outward. From the above, the planar portion 17 and the convex portion 16 of the container 10 are integrally molded. The side of the convex portion 16 protrudes vertically from the planar portion 17. The container 10 has one protrusion 16 at one end of the first surface 21 and no protrusion on the second surface 22.

[0021] In addition, a side wall 23 is erected along the periphery of the first surface 21 of one plate-like body 11, and a side wall 24 is erected along the periphery of the second surface 22 of the other plate-like body 12. The tip of the side wall 23 of one plate-like body 11 and the tip of the side wall 24 of the other plate-like body 12 are arranged opposite to each other and abut against each other to form a hollow portion 13, which is the internal space of the container 10. Therefore, the side walls 23 and 24 form the side surface of the container 10. The hollow portion 13 is a sealed space, and is depressurized by a degassing process. The internal space of the protruding portion 16 of the container 10 is connected to the internal space of the flat portion 17, and the hollow portion 13 of the container 10 is formed by the internal space of the protruding portion 16 and the internal space of the flat portion 17. Therefore, the working fluid can flow between the internal space of the protruding portion 16 and the internal space of the flat portion 17. Moreover, the heat sink 1 has one container 10, and the internal space of the container 10 which exerts the heat transport function is in a connected, integrated form.

[0022] The shape of the container 10 is not particularly limited, but in the heat sink 1, for example, in a plan view (when viewed vertically to the flat surface 17 of the container 10), the protrusion 16 is rectangular, and the area of ​​the flat surface 17 of the container 10 is wider than the protrusion 16. More specifically, the container 10 has a portion that becomes wider from the protrusion 16 toward the area of ​​the flat surface 17 in a plan view.

[0023] In the heat sink 1, a first heat dissipation fin 41 is provided on the outer surface of the flat portion 32 of the first surface 21 of the container 10, and the first heat dissipation fin 41 is thermally connected to the container 10. The first heat dissipation fin 41 is provided on the other end of the first surface 21 of the container 10 in the heat transport direction H. A plurality of first heat dissipation fins 41 are arranged in parallel at a predetermined interval along the width direction W of the container 10, i.e., along a direction perpendicular to the heat transport direction H of the container 10. A plurality of first heat dissipation fins 41 are arranged in parallel to form a first heat dissipation fin group 42. In the heat sink 1, the heights of the plurality of first heat dissipation fins 41, 41, 41... that form the first heat dissipation fin group 42 are all approximately the same. In addition, the height of the first heat dissipation fin 41 is equal to or less than the height of the protrusion 16. In the heat sink 1, the height of the first heat dissipation fin 41 is lower than the height of the convex portion 16, and the tip of the first heat dissipation fin 41 is recessed toward the flat portion 17 of the container 10 from the tip of the convex portion 16.

[0024] On the other hand, on the first surface 21 of the container 10, no first heat dissipation fins 41 are provided on the protrusion 16 located at one end of the heat transport direction H of the container 10 and on the central portion of the container 10 in the heat transport direction H.

[0025] As shown in FIGS. 1 and 2, the convex portion 16 of the container 10 is a portion to which the heating element 100, which is an object to be cooled, is thermally connected, and functions as a heat receiving portion of the heat sink 1. The heating element 100 is thermally connected to the tip of the convex portion 16. As described above, the convex portion 16 has a heat receiving portion to which the heating element 100 is thermally connected, and no heat dissipation fin is provided at the tip of the convex portion 16 to which the heating element 100 is thermally connected. The heating element 100 may be, for example, an electronic component such as a central processing unit mounted on a wiring board 202. Since the tip of the first heat dissipation fin 41 is located in the direction of the flat portion 17 of the container 10 rather than the tip of the convex portion 16, even if the heating element 100 is mounted on the wiring board 202, the heating element 100 can be thermally connected to the tip of the convex portion 16 without being obstructed by the first heat dissipation fin 41.

[0026] The second surface 22 does not have any convex portion, and is entirely flat. A second heat dissipation fin 43 is erected on the outer surface of the second surface 22, and the second heat dissipation fin 43 is thermally connected to the container 10. The second heat dissipation fin 43 is erected on the other end of the second surface 22 of the container 10 in the heat transport direction H. Therefore, the second heat dissipation fin 43 is disposed opposite the first heat dissipation fin 41 through the other end of the container 10. The second heat dissipation fin 43 is erected on the outer surface of the second surface 22 so that the main surface of the second heat dissipation fin 43 is approximately parallel to the main surface of the first heat dissipation fin 41. The second heat dissipation fins 43 are arranged in parallel at a predetermined interval along the width direction W of the container 10. The second heat dissipation fins 43 are arranged in parallel to each other to form a second heat dissipation fin group 44. In the heat sink 1, the heights of the plurality of second heat dissipating fins 43, 43, 43... that form the second heat dissipating fin group 44 are all substantially the same.

[0027] From the above, at the other end of the container 10 in the heat transport direction H, the heat dissipation fins are thermally connected to the first surface 21 and the second surface 22, i.e., both surfaces of the plate-shaped container 10. From the above, at the other end of the container 10 in the heat transport direction H, the heat dissipation fins are thermally connected to the container 10 in a manner that they are divided onto both surfaces of the container 10 (i.e., the first surface 21 and the second surface 22). The other end of the container 10 in the heat transport direction H to which the first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected forms an area 45 of the heat dissipation portion of the heat sink 1.

[0028] On the other hand, the second heat dissipation fin 43 is not provided at one end of the container 10 in the heat transport direction H and at the center of the container 10 in the heat transport direction H. From the above, the heat dissipation fin is not provided at one end of the container 10 in the heat transport direction H and at the center of the container 10 in the heat transport direction H where the protrusion 16 is provided. In addition, the heating element 100, which is the object to be cooled, is not thermally connected to the second surface 22. Note that, in the heat sink 1, the protrusion 16 is provided at one end of the first surface 21, toward the region 45 of the heat dissipation portion rather than the side wall 23 erected along the periphery of the first surface 21. Therefore, the flat surface portion 17 is also provided between the protrusion 16 and the side wall 23 erected along the periphery of the first surface 21 at one end of the first surface 21.

[0029] The flat surface 17 of the container 10 has a heat dissipation region 45 where the first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected, and an intermediate region 50 provided between the protrusion 16 and the heat dissipation region 45 where neither the heating element 100 nor the heat dissipation fins (the first heat dissipation fin 41 and the second heat dissipation fin 43) are thermally connected. The intermediate region 50 is provided between the protrusion 16 and the heat dissipation region 45 in the heat transport direction H of the container 10. In the heat sink 1, the intermediate region 50 of the container 10 is a region where active heat reception and heat dissipation are not performed. From the above, in the heat sink 1, the intermediate region 50 of the container 10 functions as a heat insulating section. Therefore, in the heat sink 1, the flat portion 17 of the container 10 has an intermediate region 50 located on the protrusion 16 side to which the heat dissipation fins are not thermally connected, and a heat dissipation region 45 located farther away from the protrusion 16 than the intermediate region 50 and to which the heat dissipation fins are thermally connected.

[0030] The container 10 has a region that becomes wider from the convex portion 16 toward the region of the flat portion 17 in a plan view, so that the region 45 of the heat dissipation portion of the container 10 is wider than the convex portion 16 having the heat receiving portion, and the container 10 has a region that becomes wider from the convex portion 16 toward the region 45 of the heat dissipation portion. In the heat sink 1, the region 50 of the middle portion becomes wider from the convex portion 16 toward the region 45 of the heat dissipation portion.

[0031] In the heat sink 1, the heat from the heating element 100 is transported from the convex portion 16, which is the heat receiving portion, through an intermediate region 50 of the flat portion 17 that is close to the convex portion 16, to a region 45 of the heat dissipation portion that is away from the convex portion 16 on the flat portion 17, and is dissipated to the external environment in the region 45 of the heat dissipation portion.

[0032] A wick structure (not shown) that generates a capillary force is provided in the cavity 13 of the container 10. The wick structure is provided, for example, over the entire container 10. The working fluid that has changed phase from gas phase to liquid phase in the region 45 of the heat dissipation part of the container 10 due to the capillary force of the wick structure flows back from the region 45 of the heat dissipation part of the container 10 to the protrusion 16 having a heat receiving part. The wick structure is not particularly limited, but examples thereof include a sintered body of metal powder such as copper powder, a metal mesh made of metal wire, a nonwoven fabric, grooves (multiple fine grooves) formed on the inner surface of the container 10, and combinations thereof. In addition, a first wick structure having a large capillary force is provided as a wick structure in the heat receiving part of the protrusion 16 to which the heating element 100 is connected, i.e., the bottom part of the protrusion 16, to prevent dryout. On the other hand, by providing a second wick structure having a smaller capillary force than the first wick structure on a portion other than the bottom of the protrusion 16, for example, on the side surface of the protrusion 16 of the container 10 and the flat surface portion 17 or side surface of the container 10, it is possible to reduce the flow path resistance when the liquid phase working fluid returns. When the wick structure is, for example, a sintered body of metal powder, the average primary particle diameter of the metal powder used as the raw material for the first wick structure is, for example, 1.0 nm or more and 10 μm or less, and the average primary particle diameter of the metal powder used as the raw material for the second wick structure is, for example, 50 μm or more and 300 μm or less.

[0033] The vapor flow path 15 is an internal space of the container 10 and extends throughout the container 10. Therefore, the vapor-phase working fluid can circulate throughout the container 10 through the vapor flow path 15. In addition, the vapor flow path 15 may be provided with a pillar (not shown) that is a columnar member in order to maintain the internal space of the container 10, as necessary. The pillar is not particularly limited, but examples of the pillar include a composite pillar in which a wick structure is coated around a columnar metal member (e.g., a copper member), a columnar sintered body of metal powder such as copper powder, and the like, in order to reduce the flow path resistance when the liquid-phase working fluid returns.

[0034] Examples of the material of the container 10 include stainless steel, copper, copper alloy, aluminum, aluminum alloy, tin, tin alloy, titanium, titanium alloy, nickel, nickel alloy, etc. The material of the first heat dissipation fin 41 and the second heat dissipation fin 43 is not particularly limited, and examples of the material include metal materials such as copper, copper alloy, aluminum, aluminum alloy, carbon materials such as graphite, composite members using carbon materials, etc.

[0035] The working fluid to be filled in the cavity 13 can be appropriately selected depending on the compatibility with the material of the container 10, and examples of the working fluid include water, fluorocarbons, cyclopentane, ethylene glycol, etc. These may be used alone or in combination of two or more kinds.

[0036] Furthermore, the heat sink 1 may be forcedly air-cooled by a blower fan (not shown) as necessary. Cooling air from the blower fan is supplied along the main surfaces of the first heat dissipating fin 41 and the second heat dissipating fin 43, thereby facilitating cooling of the first heat dissipating fin group 42 and the second heat dissipating fin group 44.

[0037] Next, the mechanism of the cooling function of the heat sink 1 will be described. First, the heating element 100, which is an object to be cooled, is thermally connected to the tip of the convex portion 16 of the container 10. When the container 10 receives heat from the heating element 100 at the convex portion 16, the heat is transferred from the heating element 100 to the liquid-phase working fluid in the cavity portion 13 at the convex portion 16 of the container 10, and the liquid-phase working fluid changes phase to a gas-phase working fluid. The gas-phase working fluid flows through the vapor flow path 15 from the convex portion 16 of the container 10 through the region 50 in the middle portion of the flat portion 17 connected to the convex portion 16 to the region 45 of the heat dissipation portion of the flat portion 17. The gas-phase working fluid flows from the convex portion 16 of the container 10 through the region 50 in the middle portion of the flat portion 17 to the region 45 of the heat dissipation portion of the flat portion 17, so that the heat from the heating element 100 is transported from the convex portion 16 of the container 10 to the region 45 of the heat dissipation portion. The gas-phase working fluid that has flowed from the convex portion 16 to the region 45 of the heat dissipation portion releases latent heat and changes phase from gas to liquid due to the heat exchange action of the first heat dissipation fin group 42 and the second heat dissipation fin group 44. The released latent heat is transferred to the first heat dissipation fin group 42 and the second heat dissipation fin group 44 that are thermally connected to the region 45 of the heat dissipation portion of the container 10. The heat transferred from the container 10 to the first heat dissipation fin group 42 and the second heat dissipation fin group 44 is released to the external environment of the heat sink 1 via the first heat dissipation fin group 42 and the second heat dissipation fin group 44. The working fluid that has released the latent heat and changed phase from gas to liquid returns to the convex portion 16 from the region 45 of the heat dissipation portion of the container 10 through the region 50 of the middle portion by the capillary force of the wick structure provided in the container 10.

[0038] In the heat sink 1 according to the first embodiment of the present invention, the container 10 has a flat portion 17 and a protruding portion 16 protruding outward from the flat portion 17, and the protruding portion 16 has a heat receiving portion to which the heat generating element 100, which is the object to be cooled, is thermally connected. Therefore, even if other components 200 mounted on a wiring board 202 are arranged around the heat generating element 100 or an obstacle 201 is installed above the heat generating element 100 or the other components 200, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. That is, in the heat sink 1, the flat portion 17 has an intermediate region 50 connected to the protruding portion 16, and the intermediate region 50 functions as an avoidance portion for avoiding the other components 200. Therefore, even if other components 200 or obstacles 201 are arranged around the heat generating element 100, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. Therefore, the heat sink 1 has excellent thermal connectivity between the container 10 and the heating element 100 and has excellent cooling properties.

[0039] In addition, in the heat sink 1, the internal space of the container 10 is in a connected, integrated form, and the cross-sectional area of ​​the container 10 in the direction perpendicular to the heat transport direction H is increased, resulting in an excellent heat transport capacity. Therefore, in the heat sink 1, the flat portion 17 of the container 10 is located on the protruding portion 16 side, has an intermediate region 50 to which the heat dissipation fins are not thermally connected and functions as an avoidance portion for avoiding other components 200, and has a heat dissipation portion region 45 that is farther away from the protruding portion 16 than the intermediate region 50 and to which the heat dissipation fins (first heat dissipation fin 41 and second heat dissipation fin 43) are thermally connected, thereby exhibiting an excellent heat transport capacity when transporting heat from the heat generating body 100, which is the object to be cooled, to the heat dissipation portion region 45 via the intermediate region 50, resulting in excellent cooling characteristics.

[0040] In addition, in the heat sink 1, the fin area of ​​the fins can be increased by having the first fin 41 thermally connected to the first main surface 21 and the second fin 43 thermally connected to the second main surface 22, and therefore further excellent cooling characteristics can be exhibited. In addition, in the heat sink 1, the fins are thermally connected to the region 45 of the heat dissipation section of the container 10 in a state in which the fins are divided into the first fin 41 and the second fin 43, so that even if the fin area of ​​the fins is increased, it is possible to prevent the occurrence of a region of the fins that cannot sufficiently contribute to heat dissipation, and improve the heat dissipation efficiency of the fins.

[0041] In addition, in the heat sink 1, the region 45 of the heat dissipation portion of the container 10 is wider than the protrusion 16, so that the number of first heat dissipation fins 41 and second heat dissipation fins 43 can be increased, and thus even better cooling characteristics can be exhibited. In addition, in the heat sink 1, the intermediate region 50 becomes wider from the protrusion 16 toward the region 45 of the heat dissipation portion, so that the amount of heat transport from the protrusion 16 to the region 50 of the heat dissipation portion can be further improved.

[0042] Next, a heat sink according to a second embodiment of the present invention will be described in detail. The heat sink according to the second embodiment has major components in common with the heat sink according to the first embodiment, so the same components as those in the heat sink according to the first embodiment will be described using the same reference numerals. FIG. 3 is a plan view illustrating an overview of the heat sink according to the second embodiment of the present invention. FIG. 4 is a side view illustrating an overview of the heat sink according to the second embodiment of the present invention.

[0043] In the heat sink 1 according to the first embodiment, the container 10 has a middle region 50 which becomes wider in plan view from the protrusions 16 toward the heat dissipation region 45. However, in place of this, in the heat sink 2 according to the second embodiment of the present invention, as shown in Figures 3 and 4, the size of the container 10 in the direction perpendicular to the heat transport direction H, i.e., in the width direction W, is approximately the same in the protrusions 16 and the middle region 50, and the heat dissipation region 45 is wider than the middle region 50. In the heat sink 2, the container 10 has a T-shape in plan view.

[0044] In the heat sink 2 according to the second embodiment, the region 45 of the heat dissipation portion of the container 10 is wider than the protrusion 16, so that the number of first heat dissipation fins 41 and second heat dissipation fins 43 can be increased, and thus even better cooling characteristics can be exhibited. Moreover, in the heat sink 2, even if the intermediate region 50 is an even smaller space that cannot be made wider than the protrusion 16, it can be thermally connected to the heat generating element 100 and can cool the heat generating element 100.

[0045] Next, the heat sink according to the third embodiment of the present invention will be described in detail. The heat sink according to the third embodiment has major components in common with the heat sinks according to the first and second embodiments, so the same components as those of the heat sinks according to the first and second embodiments will be described using the same reference numerals. Fig. 5 is a plan view illustrating the outline of the heat sink according to the third embodiment of the present invention. Fig. 6 is a side view illustrating the outline of the heat sink according to the third embodiment of the present invention.

[0046] In the heat sink 1 according to the first embodiment, the container 10 becomes wider in width from the protrusions 16 to the heat dissipation region 45 in plan view, but instead, as shown in Figures 5 and 6, in the heat sink 3 according to the third embodiment of the present invention, the size of the container 10 in the direction perpendicular to the heat transport direction H, i.e., the width direction W, is approximately the same for the protrusions 16, the intermediate region 50, and the heat dissipation region 45. In the heat sink 3, the container 10 has a shape having a longitudinal direction and a lateral direction in plan view, and specifically, is rectangular in plan view.

[0047] A protrusion 16 to which the heating element 100 is thermally connected is provided at one end in the longitudinal direction of the container 10, and the other end in the longitudinal direction of the container 10 is a heat dissipation area 45 to which the first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected. The longitudinal center of the container 10 is an intermediate area 50 to which neither the heating element 100 nor the heat dissipation fins are thermally connected, and which functions as an avoidance area to avoid other components 200.

[0048] In the heat sink 3, even if the heat dissipation area 45 and the intermediate area 50 are in an even smaller space that cannot be made wider than the protrusion 16, they can be thermally connected to the heat generating element 100 and can cool the heat generating element 100.

[0049] Even in the heat sink 3, even if other components 200 mounted on a wiring board 202 are arranged around the heating element 100 or an obstacle 201 is installed above the heating element 100 or other components 200, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10 by having the convex portion 16. That is, even in the heat sink 3, the flat portion 17 has an intermediate region 50 connected to the convex portion 16, and the intermediate region 50 functions as an avoidance portion for avoiding the other components 200. Therefore, even if other components 200 or obstacles 201 are arranged around the heating element 100, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. Therefore, the thermal connectivity between the container 10 and the heating element 100 is excellent, and the container 10 has excellent cooling characteristics. In addition, in the heat sink 3, the internal space of the container 10 is in a connected, integrated form, and the cross-sectional area of ​​the container 10 in the direction perpendicular to the heat transport direction H is increased, so that an excellent heat transport capacity is exhibited when transporting heat from the heat generating element 100, which is the object to be cooled, from the convex portion 16 through the intermediate region 50 to the region 45 of the heat dissipation section, thereby providing excellent cooling characteristics.

[0050] Next, the heat sink according to the fourth embodiment of the present invention will be described in detail. The heat sink according to the fourth embodiment has major components in common with the heat sinks according to the first to third embodiments, so the same components as those of the heat sinks according to the first to third embodiments will be described using the same reference numerals. Fig. 7 is a plan view illustrating the outline of the heat sink according to the fourth embodiment of the present invention. Fig. 8 is a side view illustrating the outline of the heat sink according to the fourth embodiment of the present invention.

[0051] In the heat sink 3 according to the third embodiment, the container 10 is a rectangle having a longitudinal direction and a lateral direction in a plan view, the protrusion 16 to which the heat generating element 100 is thermally connected is provided at one end of the container 10 in the longitudinal direction, and the other end of the container 10 in the longitudinal direction is a region 45 of the heat dissipation section to which the first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected. Instead, as shown in Figs. 7 and 8, in the heat sink 4 according to the fourth embodiment, the container 10 has a shape having a longitudinal direction and a lateral direction in a plan view, one protrusion 16 is provided at the center of the container 10 in the longitudinal direction, and both ends of the container 10 in the longitudinal direction are the regions 45 of the heat dissipation section. Therefore, the first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected to both ends of the container 10 in the longitudinal direction, respectively.

[0052] In the heat sink 4, the size of the container 10 in the direction perpendicular to the heat transport direction H, i.e., in the width direction W, is approximately the same for the protrusions 16, the intermediate region 50, and the heat dissipation region 45. In the heat sink 4, the container 10 is, specifically, rectangular in plan view.

[0053] In the heat sink 4, both ends of the container 10 in the longitudinal direction are heat dissipation areas 45, and therefore, in the heat sink 4, two heat dissipation areas 45 are provided in one container 10. Also, one protruding portion 16 is provided in the center of the container 10 in the longitudinal direction, and both ends of the container 10 in the longitudinal direction are heat dissipation areas 45, and therefore, two intermediate areas 50 formed between the protruding portion 16 and the heat dissipation area 45 are provided.

[0054] In the heat sink 4, two heat dissipation regions 45 are provided in one container 10, so that the heat generating element 100 can be sufficiently cooled even if the amount of heat generated by the heat generating element 100 increases further.

[0055] Even in the heat sink 4, even if other components 200 mounted on a wiring board 202 are arranged around the heat generating element 100 or an obstacle 201 is installed above the heat generating element 100 or other components 200, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10 by having the convex portion 16. That is, even in the heat sink 4, the flat portion 17 has an intermediate region 50 connected to the convex portion 16, and the intermediate region 50 functions as an avoidance portion for avoiding the other components 200. Therefore, even if other components 200 or obstacles 201 are arranged around the heat generating element 100, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. Therefore, the thermal connectivity between the container 10 and the heat generating element 100 is excellent, and the container 10 has excellent cooling characteristics. In addition, in the heat sink 4, the internal space of the container 10 is in a connected, integrated form, and the cross-sectional area of ​​the container 10 in the direction perpendicular to the heat transport direction H is increased, so that an excellent heat transport capacity is exhibited when transporting heat from the heat generating element 100, which is the object to be cooled, from the convex portion 16 through the two intermediate regions 50 to the two heat dissipation regions 45, thereby providing excellent cooling characteristics.

[0056] Next, the heat sink according to the fifth embodiment of the present invention will be described in detail. The heat sink according to the fifth embodiment has major components in common with the heat sinks according to the first to fourth embodiments, so the same components as those of the heat sinks according to the first to fourth embodiments will be described using the same reference numerals. Fig. 9 is a plan view illustrating the outline of the heat sink according to the fifth embodiment of the present invention. Fig. 10 is a side view illustrating the outline of the heat sink according to the fifth embodiment of the present invention.

[0057] In the heat sink 3 according to the third embodiment, the container 10 is a rectangle having a longitudinal direction and a lateral direction in a plan view, and a protrusion 16 to which the heating element 100 is thermally connected is provided at one longitudinal end of the container 10, and the other longitudinal end of the container 10 is a region 45 of the heat dissipation section to which the first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected. However, instead, as shown in Figures 9 and 10, in the heat sink 5 according to the fifth embodiment, the container 10 has one protrusion 16 at the center of the container 10 in a plan view, and the peripheral portion of the container 10 in a plan view is the region 45 of the heat dissipation section. The shape of the container 10 does not have a longitudinal direction and a lateral direction in a plan view, and is a square in a plan view.

[0058] In the heat sink 5, the region 45 of the heat dissipation portion is provided on the four sides of a square and surrounds the entire periphery of the protrusion 16. The first heat dissipation fin 41 and the second heat dissipation fin 43 are thermally connected to the entire peripheral portion of the container 10 in a plan view, so that the entire peripheral portion of the container 10 in a plan view constitutes the region 45 of the heat dissipation portion. An intermediate region 50 is formed between the protrusion 16 located at the center of the container 10 in a plan view and the region 45 of the heat dissipation portion located at the peripheral portion of the container 10 in a plan view. Therefore, the intermediate region 50 surrounds the entire periphery of the protrusion 16.

[0059] In the heat sink 5, the entire peripheral portion of the container 10 in plan view is the heat dissipation region 45, so that the heat generating element 100 can be sufficiently cooled even if the amount of heat generated by the heat generating element 100 further increases.

[0060] Even in the heat sink 5, even if other components 200 mounted on a wiring board 202 are arranged around the heating element 100 or an obstacle 201 is installed above the heating element 100 or other components 200, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10 by having the convex portion 16. That is, even in the heat sink 5, the flat portion 17 has an intermediate region 50 connected to the convex portion 16, and the intermediate region 50 functions as an avoidance portion for avoiding the other components 200. Therefore, even if other components 200 or obstacles 201 are arranged around the heating element 100, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. Therefore, the thermal connectivity between the container 10 and the heating element 100 is excellent, and the container 10 has excellent cooling characteristics. In addition, in the heat sink 5, the internal space of the container 10 is in a connected, integrated form, and the cross-sectional area of ​​the container 10 in the direction perpendicular to the heat transport direction H is increased, so that an excellent heat transport capacity is exhibited when transporting heat from the heating element 100, which is the object to be cooled, from the convex portion 16 through the intermediate region 50 around the convex portion 16 to the region 45 of the heat dissipation portion, thereby providing excellent cooling characteristics.

[0061] Next, the heat sink according to the sixth embodiment of the present invention will be described in detail. The heat sink according to the sixth embodiment has major components in common with the heat sinks according to the first to fifth embodiments, so the same components as those of the heat sinks according to the first to fifth embodiments will be described using the same reference numerals. Fig. 11 is a plan view illustrating the outline of the heat sink according to the sixth embodiment of the present invention. Fig. 12 is a side view illustrating the outline of the heat sink according to the sixth embodiment of the present invention.

[0062] In the heat sinks according to the above-mentioned embodiments, the heat dissipation area 45 is provided at the end of the container 10, but instead, as shown in Figures 11 and 12, in the heat sink 6 according to the sixth embodiment, the center in the longitudinal direction of the container 10 is the heat dissipation area 45. Also, in the heat sinks according to the above-mentioned embodiments, the container 10 has one protrusion 16, but instead, as shown in Figures 11 and 12, in the heat sink 6 according to the sixth embodiment, the container 10 has multiple protrusions 16 (two in the heat sink 6).

[0063] Specifically, in the heat sink 6, the container 10 has a shape having a longitudinal direction and a lateral direction in a plan view, and the longitudinal direction has a curved portion 60, and a protrusion 16 to which the heat generating element 100 is thermally connected is provided at one end and the other end of the container 10 in the longitudinal direction. In addition, a first heat dissipation fin 41 and a second heat dissipation fin 43 are thermally connected to the center of the container 10 in the longitudinal direction. Therefore, the center of the container 10 in the longitudinal direction is the region 45 of the heat dissipation portion. In the heat sink 6, the container 10 has a U-shape in a plan view. That is, the container 10 has the region 45 of the heat dissipation portion and extension portions extending from both ends of the region 45 of the heat dissipation portion in a direction perpendicular to the extension direction of the region 45 of the heat dissipation portion.

[0064] In the heat sink 6, a convex portion 16 is provided at each tip of the two extending portions of the container 10, and an intermediate region 50 is formed between the convex portion 16 provided at the tip of the extending portion and the region 45 of the heat dissipation portion. As described above, two intermediate regions 50 are formed. In the heat sink 6, an intermediate region 50 is formed between the convex portion 16 provided at the tip of the extending portion and the curved portion 60.

[0065] In the heat sink 6, since the container 10 has a plurality of protrusions 16, a single container 10 can cool a plurality of heating elements 100. Also, since the container 10 has a shape having a curved portion 60 in the longitudinal direction, the heat sink 6 can be installed even in a small space.

[0066] Even in the heat sink 6, even if other components 200 mounted on a wiring board 202 are arranged around the heat generating element 100 or an obstacle 201 is installed above the heat generating element 100 or other components 200, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10 by having the convex portion 16. That is, even in the heat sink 6, the flat portion 17 has an intermediate region 50 connected to the convex portion 16, and the intermediate region 50 functions as an avoidance portion for avoiding the other components 200. Therefore, even if other components 200 or obstacles 201 are arranged around the heat generating element 100, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. Therefore, the thermal connectivity between the container 10 and the heat generating element 100 is excellent, and the container 10 has excellent cooling characteristics. In addition, in the heat sink 6, the internal space of the container 10 is in a connected, integrated form, and the cross-sectional area of ​​the container 10 in the direction perpendicular to the heat transport direction H is increased, so that an excellent heat transport capacity is exhibited when transporting heat from the two heat generating bodies 100 to be cooled from the two convex portions 16 through the intermediate region 50 to the heat dissipation region 45, thereby providing excellent cooling characteristics.

[0067] Next, the heat sink according to the seventh embodiment of the present invention will be described in detail. The heat sink according to the seventh embodiment has major components in common with the heat sinks according to the first to sixth embodiments, so the same components as those in the heat sinks according to the first to sixth embodiments will be described using the same reference numerals. Fig. 13 is a plan view illustrating the outline of the heat sink according to the seventh embodiment of the present invention. Fig. 14 is a side view illustrating the outline of the heat sink according to the seventh embodiment of the present invention.

[0068] In the heat sinks according to the above-mentioned embodiments, no heat dissipation fins are provided in the intermediate region 50 of the container 10. Instead, as shown in Figs. 13 and 14, in the heat sink 7 according to the seventh embodiment, a third heat dissipation fin 63 is provided in the intermediate region 50 of the container 10. The heat sink 7 is configured such that the third heat dissipation fin 63 is further provided in the intermediate region 50 of the heat sink 2 according to the second embodiment. As described above, in the heat sink 7, the intermediate region 50 of the container 10 functions as a heat dissipation portion rather than a heat insulating portion. In this way, in the heat sink of the present invention, the thermal function of the intermediate region 50 is not particularly limited as long as other components 200 can be avoided in the intermediate region 50.

[0069] In the heat sink 7, a third heat dissipation fin 63 is provided on the second surface 22 in the intermediate region 50. The third heat dissipation fin 63 is provided in a space between the second surface 22 and an obstacle 201 disposed opposite the second surface 22.

[0070] The third heat dissipating fin 63 is provided between the second surface 22 and the obstacle 201, and therefore has a lower height than the second heat dissipating fin 43. The third heat dissipating fins 63 are arranged in parallel at a predetermined interval along the width direction W of the container 10. The third heat dissipating fins 63 are arranged in parallel to form a third heat dissipating fin group 64. In the heat sink 7, the heights of the third heat dissipating fins 63, 63, 63, . . . that form the third heat dissipating fin group 64 are all approximately the same. The third heat dissipating fin 63 may be in contact with the second heat dissipating fin 43, or may not be in contact with the second heat dissipating fin 43 and a gap may be provided between the third heat dissipating fin 63 and the second heat dissipating fin 43. In the heat sink 7, the third heat dissipating fin 63 is in contact with the second heat dissipating fin 43.

[0071] Even in the heat sink 7 in which the third heat dissipation fin 63 is provided in the intermediate region 50, the planar portion 17 has the intermediate region 50 connected to the convex portion 16, so that the intermediate region 50 can avoid other components 200, and therefore functions as an avoidance portion for the other components 200.

[0072] In the heat sinks according to the above-mentioned embodiments, the protrusion 16 is provided at one end of the first surface 21, in the direction of the heat dissipation region 45 from the side wall 23 erected along the periphery of the first surface 21, but instead, as shown in Figures 13 and 14, in the heat sink 7 according to the seventh embodiment, the protrusion 16 extends to the side wall 23 at one end of the first surface 21. Therefore, in the heat sink 7, the protrusion 16 is formed from the side wall 23 toward the intermediate region 50.

[0073] Even in the heat sink 7, even if other components 200 mounted on a wiring board 202 are arranged around the heating element 100 or an obstacle 201 is installed above the heating element 100 or the other components 200, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10 by having the convex portion 16. That is, even in the heat sink 7, the flat portion 17 has an intermediate region 50 connected to the convex portion 16, and the intermediate region 50 functions as an avoidance portion for avoiding the other components 200. Therefore, even if other components 200 or obstacles 201 are arranged around the heating element 100, the container 10 can avoid the other components 200 in the height direction of the other components 200 without bending the container 10. Therefore, the thermal connectivity between the container 10 and the heating element 100 is excellent, and the container 10 has excellent cooling characteristics. In addition, in the heat sink 7, the internal space of the container 10 is in a connected, integrated form, and the cross-sectional area of ​​the container 10 in the direction perpendicular to the heat transport direction H is increased, so that an excellent heat transport capacity is exhibited when transporting heat from the two heat generating bodies 100 to be cooled from the two convex portions 16 through the intermediate region 50 to the heat dissipation region 45, thereby providing excellent cooling characteristics.

[0074] Moreover, in the heat sink 7, the third heat dissipation fin 63 is further provided in the intermediate region 50, so that the intermediate region 50 can also function as a heat dissipation section, further improving the heat dissipation characteristics. Also, in the heat sink 7, the protrusion 16 extends to the side wall 23 portion of one end of the first surface 21, so that the heat sink 7 has excellent thermal connectivity even with the large heating element 100.

[0075] From each of the above-mentioned embodiments, it can be seen that with the heat sink of the present invention, the positions of the heat receiving section, intermediate section and heat dissipation section can be set by designing the positions of the flat sections and convex sections of the container according to the space in which the heat sink is installed, the arrangement of the heating element, the amount of heat generated, etc., thereby offering excellent design freedom even for heating elements placed in narrow spaces.

[0076] Next, other embodiments of the present invention will be described. In the heat sink of each of the above embodiments, the first heat dissipation fin is provided on the first surface of the container, and the second heat dissipation fin is provided on the second surface, but the heat dissipation fin may be provided on only one of the first surface and the second surface.

[0077] In the heat sinks according to the third and fourth embodiments, the shape of the container having a longitudinal direction and a transverse direction in plan view was rectangular, but the shape of the container having a longitudinal direction and a transverse direction is not particularly limited and may be a polygonal shape having pentagons or more sides in plan view, an ellipse, etc. Also, in the heat sink according to the fifth embodiment, the shape of the container not having a longitudinal direction and a transverse direction in plan view was square, but instead may be a circle, etc. [Industrial Applicability]

[0078] The heat sink of the present invention has excellent thermal connectivity with the heat generating body to be cooled, even when other components are placed around the heat generating body, and also exhibits excellent heat transport capacity when transporting heat from the heat generating body to be cooled, making it highly useful in fields such as cooling electronic components that generate a lot of heat and are installed in small spaces, such as electronic components mounted on servers. [Explanation of symbols]

[0079] 1, 2, 3, 4, 5, 6, 7 Heatsink 10 Container 11 One plate 12 The other plate 13 Cavity 15 Steam flow path 16 Convex 17 Plane part 21 First Side 22 The Second Side 41 First heat dissipation fin 43 Second heat dissipation fin 45 Heat dissipation area 50 Middle Area

Claims

1. a container having a cavity formed therein and having a first main surface and a second main surface opposite to the first main surface; a working fluid sealed in the cavity; and a vapor flow path provided in the cavity through which the working fluid in a gas phase flows; The container has a flat surface and a protrusion protruding outward from the flat surface, The internal space of the protruding portion of the container is in communication with the internal space of the flat portion, thereby forming the hollow portion, the protrusion of the container has a heat receiving portion to which a heat generating element to be cooled is thermally connected, the flat surface of the container has an intermediate region connected to the protruding portion, and a heat dissipation region to which a heat dissipation fin is thermally connected, the heat dissipation region being farther away from the protruding portion than the intermediate region, The width of the intermediate region is increased from the convex portion toward the heat dissipation region, so that the width of the intermediate region is greater than the width of the convex portion, and thus the cross-sectional area of ​​the container in the direction perpendicular to the heat transport direction is increased. a first wick structure is provided on the bottom of the convex portion, and a second wick structure having a capillary force smaller than that of the first wick structure is provided on the side of the convex portion, the flat portion, and the side of the container, so that the wick structure is formed over the entire inner surface of the container; The heat sink has a region in the heat dissipation portion that becomes wider with increasing distance from the protrusion.

2. The heat sink of claim 1 , wherein the heat dissipation fins include a first heat dissipation fin thermally connected to the first main surface and a second heat dissipation fin thermally connected to the second main surface.

3. 3. The heat sink according to claim 1, wherein the heat dissipation portion of the container has a width greater than that of the protrusion.

4. 3. The heat sink according to claim 1, wherein the container is formed by one plate-shaped body and another plate-shaped body facing the one plate-shaped body, and the one plate-shaped body has a convex portion protruding outward.

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